Dual Modulation of Single Molecule Conductance via Tuning Side Chains and Electric Field with Conjugated Molecules Entailing Intramolecular O•••S Interactions

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Wei Xu
  • Kai Song
  • Taige Lu
  • Guanxin Zhang
  • Yaping Zang
  • Wenjing Hong
  • Deqing Zhang

Detail(s)

Original languageEnglish
Article number2105667
Journal / PublicationAdvanced Science
Volume9
Issue number17
Online published17 Apr 2022
Publication statusPublished - 13 Jun 2022
Externally publishedYes

Link(s)

Abstract

Herein, single-molecule conductance studies of TBT1-TBT6 which entails 1,4-dithienylbenzene as the backbone and -SMe groups as the anchoring units, with the scanning tunneling microscope break junction (STM-BJ) technique, are reported. The molecular conductance of TBT1 with intramolecular O•••S noncovalent interactions is enhanced by about one order of magnitude in comparison to their analogue TBT2 (which contains alkyl instead of alkoxy chains). By replacing the methoxy groups in TBT1 with extending alkoxy chains in TBT3, TBT4, and TBT5, the molecular backbones become twisted and as a consequence the single-molecule conductance decreases gradually, showing that the intramolecular O•••S noncovalent interaction is influenced by the structural features of alkoxy chains. More importantly, the single-molecule conductance of TBT3, TBT4, and TBT5 can be boosted by increasing the electric field applied to the molecular junctions. Remarkably, the conductance of TBT3, TBT4, and TBT5 can be reversibly modulated due to the conformational changes between twisted and planar ones by varying the electric field. These results demonstrate that molecules with intramolecular O•••S noncovalent interactions have the potential for in situ control of the electrical properties of molecular-scale devices.

Research Area(s)

  • electric fields, intramolecular conformational tuning, molecular switch, single-molecule conductance

Citation Format(s)

Dual Modulation of Single Molecule Conductance via Tuning Side Chains and Electric Field with Conjugated Molecules Entailing Intramolecular O•••S Interactions. / Zhang, Hua; Xu, Wei; Song, Kai et al.
In: Advanced Science, Vol. 9, No. 17, 2105667, 13.06.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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